What's new in KB5079466 (Windows 11 build 28000.1719)
- Windows 11, version 26H1
- OS Build 28000.1719
Maya Reyes3 min readQuick answer
KB5079466 is a mandatory cumulative security update released on March 10, 2026, for devices running Windows 11, version 26H1. Installing this update increments your system build number to OS Build 28000.1719 and applies monthly security maintenance and quality fixes. You can obtain this update automatically via Windows Update or download it manually from the Microsoft Update Catalog.
Microsoft released KB5079466 on March 10, 2026, for PCs running Windows 11, version 26H1. As a regular Patch Tuesday release, this cumulative update updates the underlying operating system build to OS Build 28000.1719. It delivers monthly security patches, reliability updates, and underlying quality improvements designed to keep Windows 11 systems running smoothly and securely.
This release fits directly into Microsoft's established servicing lifecycle for Windows 11, version 26H1. It builds upon previous updates in the 26H1 release channel, including the February 10, 2026 security release KB5077179 (OS Build 28000.1575) and the February 24, 2026 preview update KB5077239 (OS Build 28000.1643). On the same date, Microsoft released matching updates for other supported versions of Windows 11, including KB5079473 (OS Builds 26200.8037 and 26100.8037) for version 25H2 and version 24H2, as well as KB5078883 (OS Build 22631.6783) for version 23H2.
Keeping track of cumulative updates helps ensure that your system stays updated with the latest security baseline. When KB5079466 installs, it updates core system binaries and rolls up previous changes from earlier preview releases. Windows 11 version 26H1 receives regular updates on this schedule, leading into subsequent monthly updates such as KB5079489 (OS Build 28000.1764) Preview on March 26, 2026, KB5083768 (OS Build 28000.1836) on April 14, 2026, KB5083806 (OS Build 28000.1896) Preview on April 30, 2026, KB5089548 (OS Build 28000.2113) on May 12, 2026, KB5089570 (OS Build 28000.2179) Preview on May 26, 2026, KB5095051 (OS Build 28000.2269) on June 9, 2026, KB5095091 (OS Build 28000.2340) Preview on June 23, 2026, KB5101649 (OS Build 28000.2525) on July 14, 2026, KB5101681 (OS Build 28000.2608) Preview on July 28, 2026, KB5121000 (OS Build 28000.2704) on August 11, 2026, KB5120996 (OS Build 28000.2804) Preview on August 27, 2026, KB5124012 (OS Build 28000.2954) on September 8, 2026, KB5129194 (OS Build 28000.2956) Out-of-band on September 14, 2026, and KB5124006 (OS Build 28000.3086) Preview on September 22, 2026.
Highlights
- Version target: Updates systems running Windows 11, version 26H1 to OS Build 28000.1719.
- Cumulative fixes: Incorporates prior improvements introduced in the February 24, 2026 preview update KB5077239 (OS Build 28000.1643).
- Security baseline: Builds upon the February 10, 2026 cumulative release KB5077179 (OS Build 28000.1575) to maintain core system protection.
- Multi-version alignment: Released alongside KB5079473 (OS Builds 26200.8037 and 26100.8037) for Windows 11 versions 25H2 and 24H2.
- Servicing synchronization: Released concurrently with KB5078883 (OS Build 22631.6783) for Windows 11 version 23H2.
Known issues
Microsoft reports no known issues for this update.
Should you install it?
KB5079466 is a mandatory security update for all users operating Windows 11, version 26H1. Because it includes important security vulnerabilities patches and underlying system stability enhancements, Microsoft recommends applying it promptly to ensure your computer remains protected.
Since this update is delivered as part of standard Patch Tuesday servicing rather than an optional preview release, Windows Update will download and install KB5079466 automatically. General users do not need to delay installation unless they are managing specialized enterprise deployments or troubleshooting active system conflicts.
How to get it
Illustration: the Troubleshoot > Other troubleshooters page under Settings > System
You can receive KB5079466 automatically through Windows Update or manually download the standalone package from the Microsoft Update Catalog.
To install the update using Windows Update:
- Click the Start button and select Settings, or press Windows key + I.
- Choose Windows Update from the navigation sidebar on the left.
- Click the Check for updates button on the right.
- Allow Windows Update to download and install KB5079466 (OS Build 28000.1719).
- Save any open documents and click Restart now when prompted to finalize the update process.
To download the standalone installer from the Microsoft Update Catalog:
- Open your web browser and go to the official Microsoft Update Catalog website.
- Type KB5079466 into the search box and click Search.
- Locate the entry corresponding to your system architecture (x64 or ARM64) for Windows 11, version 26H1.
- Click Download next to the matching file to save the .msu installer package to your device.
- Open your downloads folder, double-click the .msu file, follow the installation prompts, and restart your computer.
If the update fails to complete or gets stuck during installation, you can run the Windows Update troubleshooter by going to Settings > System > Troubleshoot > Other troubleshooters and selecting Windows Update.
Sources
Frequently asked questions
What is KB5079466?
KB5079466 is a mandatory cumulative security update released on March 10, 2026, for devices running Windows 11, version 26H1. It advances your system build number to OS Build 28000.1719.
Is KB5079466 required for Windows 11 version 26H1?
Yes, KB5079466 is a standard monthly security update. It installs automatically via Windows Update to provide essential security patches and system quality fixes.
How do I check if KB5079466 is installed on my PC?
Open Settings > System > About and check your Windows build number. If it displays OS Build 28000.1719, KB5079466 is installed on your computer.
What should I do if KB5079466 fails to install?
If KB5079466 fails to install, run the Windows Update troubleshooter from Settings > System > Troubleshoot > Other troubleshooters, or download the standalone installer from the Microsoft Update Catalog.
Checked against Microsoft's release notes on ; re-checked when a new build ships.
Covers Windows 11 update releases and the problems that follow them. Tracks Microsoft's release-health notes daily and flags known issues the same day they appear.
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